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Across 1. the brightness of a star when viewed from earth 3. a body of rock and metal that are held together by frozen gasses orbiting the sun 7. moon moves directly between earth and the sun causing a shadow on the earth 9. the fuzzy, gaseous component of a comets head 10. describes the view that the sun is at the center of the solar system 12. a slow motion of earth’s axis that traces out a cone over a period of 26000 years 13. any earth like planets 15. a continuous spectrum produced when white light is passed though a cool gas under low pressure. 17. the point in the orbit of a planet where it is closest to the sun 20. The spectrum of bright lines, bands, or continuous radiation characteristic of and determined by a specific emitting substance 22. obvious change in Frequency sound waves caused by relative motions from the sources and observer. 24. Meteoroid that travels through earth and burns up 25. a plot of stars according to their absolute magnitudes and temperature 26. one of two stars revolving around a common center of mass under their mutual gravitational attraction 29. continuous light emitted by a solid liquid or gas under pressure 30. the distance light travels in a year 31. a law that states galaxies are retreating at a speed proportional to their distance 32. the place in the orbit of a planet where the planet is farthest from the sun 33. a group of stars dust and gasses held together by gravity 34. moon passes through earth’s shadow

Down 1. the apparent brightness of a star if it were viewed from a distance of 32.6 light-years 2. any portion of a meteoroid that reaches earth’s surface 4. the study of the properties of light that depend on wave length 5. the arrangement of electromagnetic radiation according to wave length 6. describes the concept of an earth-centered universe 8. a small solid partial that travels in space 11. AU 14. the apparent westward motion of the planets with respect to the stars 16. an oval 18. point at which the moon is farthest from the earth 19. lass massive nuclei combine with more massive nuclei creating bigger nuclei, creates massive amount of energy 21. low density, Huge Gas Giants 23. the point at which the moon is closest to earth 27. rock from space 28. the angle between two imaginary lines from two different observation points meeting at an astronomical object, used to measure the object's distance from Earth